I have done some of the work but I keep getting stuck solving the equation for number two. I know at .25 the demand is 400 but to solve for whether it is inelastic or elastic and on I cannot seem to get it. Our profesor provides is with some videos but I cant seem to follow through his steps. Ultimately I end up getting confused. Although the answers are readily available online I would like to learn how to solve it. Please help me follow through with the equations. Thank you

The following table shows this year's demand and supply schedules of U.S. candy bars: Price Dollars a. Graph the supply and demand curves. What is the equilibrium price and quantity? b. What is the price elasticity (point elasticity) of demand when price is .25? c. What is the price elasticity of supply when price is .10? Price is .25? d. The economists in the forecasting department of the U.S. candy bar association predicts that in the next year candy sales will jump to 800 million at a price of 10 cents a piece. What are the possible factors th can cause such a change?l